Move the world out of /zfs/ and seperate out module build tree

1 files changed, 2418 insertions, 0 deletions

diff --git a/cmd/zdb/zdb.c b/cmd/zdb/zdb.c
new file mode 100644
index 000000000..253a1346a
--- /dev/null
+++ b/cmd/zdb/zdb.c
@@ -0,0 +1,2418 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#include <stdio.h>
+#include <stdio_ext.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <sys/zfs_context.h>
+#include <sys/spa.h>
+#include <sys/spa_impl.h>
+#include <sys/dmu.h>
+#include <sys/zap.h>
+#include <sys/fs/zfs.h>
+#include <sys/zfs_znode.h>
+#include <sys/vdev.h>
+#include <sys/vdev_impl.h>
+#include <sys/metaslab_impl.h>
+#include <sys/dmu_objset.h>
+#include <sys/dsl_dir.h>
+#include <sys/dsl_dataset.h>
+#include <sys/dsl_pool.h>
+#include <sys/dbuf.h>
+#include <sys/zil.h>
+#include <sys/zil_impl.h>
+#include <sys/stat.h>
+#include <sys/resource.h>
+#include <sys/dmu_traverse.h>
+#include <sys/zio_checksum.h>
+#include <sys/zio_compress.h>
+#include <sys/zfs_fuid.h>
+#include <sys/arc.h>
+#undef ZFS_MAXNAMELEN
+#undef verify
+#include <libzfs.h>
+
+const char cmdname[] = "zdb";
+uint8_t dump_opt[256];
+
+typedef void object_viewer_t(objset_t *, uint64_t, void *data, size_t size);
+
+extern void dump_intent_log(zilog_t *);
+uint64_t *zopt_object = NULL;
+int zopt_objects = 0;
+libzfs_handle_t *g_zfs;
+boolean_t zdb_sig_user_data = B_TRUE;
+int zdb_sig_cksumalg = ZIO_CHECKSUM_SHA256;
+
+/*
+ * These libumem hooks provide a reasonable set of defaults for the allocator's
+ * debugging facilities.
+ */
+const char *
+_umem_debug_init()
+{
+	return ("default,verbose"); /* $UMEM_DEBUG setting */
+}
+
+const char *
+_umem_logging_init(void)
+{
+	return ("fail,contents"); /* $UMEM_LOGGING setting */
+}
+
+static void
+usage(void)
+{
+	(void) fprintf(stderr,
+	    "Usage: %s [-udibcsv] [-U cachefile_path] "
+	    "[-S user:cksumalg] "
+	    "dataset [object...]\n"
+	    "       %s -C [pool]\n"
+	    "       %s -l dev\n"
+	    "       %s -R pool:vdev:offset:size:flags\n"
+	    "       %s [-p path_to_vdev_dir]\n"
+	    "       %s -e pool | GUID | devid ...\n",
+	    cmdname, cmdname, cmdname, cmdname, cmdname, cmdname);
+
+	(void) fprintf(stderr, "	-u uberblock\n");
+	(void) fprintf(stderr, "	-d datasets\n");
+	(void) fprintf(stderr, "        -C cached pool configuration\n");
+	(void) fprintf(stderr, "	-i intent logs\n");
+	(void) fprintf(stderr, "	-b block statistics\n");
+	(void) fprintf(stderr, "	-c checksum all data blocks\n");
+	(void) fprintf(stderr, "	-s report stats on zdb's I/O\n");
+	(void) fprintf(stderr, "	-S <user|all>:<cksum_alg|all> -- "
+	    "dump blkptr signatures\n");
+	(void) fprintf(stderr, "	-v verbose (applies to all others)\n");
+	(void) fprintf(stderr, "        -l dump label contents\n");
+	(void) fprintf(stderr, "	-U cachefile_path -- use alternate "
+	    "cachefile\n");
+	(void) fprintf(stderr, "        -R read and display block from a "
+	    "device\n");
+	(void) fprintf(stderr, "        -e Pool is exported/destroyed/"
+	    "has altroot\n");
+	(void) fprintf(stderr, "	-p <Path to vdev dir> (use with -e)\n");
+	(void) fprintf(stderr, "Specify an option more than once (e.g. -bb) "
+	    "to make only that option verbose\n");
+	(void) fprintf(stderr, "Default is to dump everything non-verbosely\n");
+	exit(1);
+}
+
+static void
+fatal(const char *fmt, ...)
+{
+	va_list ap;
+
+	va_start(ap, fmt);
+	(void) fprintf(stderr, "%s: ", cmdname);
+	(void) vfprintf(stderr, fmt, ap);
+	va_end(ap);
+	(void) fprintf(stderr, "\n");
+
+	abort();
+}
+
+static void
+dump_nvlist(nvlist_t *list, int indent)
+{
+	nvpair_t *elem = NULL;
+
+	while ((elem = nvlist_next_nvpair(list, elem)) != NULL) {
+		switch (nvpair_type(elem)) {
+		case DATA_TYPE_STRING:
+			{
+				char *value;
+
+				VERIFY(nvpair_value_string(elem, &value) == 0);
+				(void) printf("%*s%s='%s'\n", indent, "",
+				    nvpair_name(elem), value);
+			}
+			break;
+
+		case DATA_TYPE_UINT64:
+			{
+				uint64_t value;
+
+				VERIFY(nvpair_value_uint64(elem, &value) == 0);
+				(void) printf("%*s%s=%llu\n", indent, "",
+				    nvpair_name(elem), (u_longlong_t)value);
+			}
+			break;
+
+		case DATA_TYPE_NVLIST:
+			{
+				nvlist_t *value;
+
+				VERIFY(nvpair_value_nvlist(elem, &value) == 0);
+				(void) printf("%*s%s\n", indent, "",
+				    nvpair_name(elem));
+				dump_nvlist(value, indent + 4);
+			}
+			break;
+
+		case DATA_TYPE_NVLIST_ARRAY:
+			{
+				nvlist_t **value;
+				uint_t c, count;
+
+				VERIFY(nvpair_value_nvlist_array(elem, &value,
+				    &count) == 0);
+
+				for (c = 0; c < count; c++) {
+					(void) printf("%*s%s[%u]\n", indent, "",
+					    nvpair_name(elem), c);
+					dump_nvlist(value[c], indent + 8);
+				}
+			}
+			break;
+
+		default:
+
+			(void) printf("bad config type %d for %s\n",
+			    nvpair_type(elem), nvpair_name(elem));
+		}
+	}
+}
+
+/* ARGSUSED */
+static void
+dump_packed_nvlist(objset_t *os, uint64_t object, void *data, size_t size)
+{
+	nvlist_t *nv;
+	size_t nvsize = *(uint64_t *)data;
+	char *packed = umem_alloc(nvsize, UMEM_NOFAIL);
+
+	VERIFY(0 == dmu_read(os, object, 0, nvsize, packed));
+
+	VERIFY(nvlist_unpack(packed, nvsize, &nv, 0) == 0);
+
+	umem_free(packed, nvsize);
+
+	dump_nvlist(nv, 8);
+
+	nvlist_free(nv);
+}
+
+const char dump_zap_stars[] = "****************************************";
+const int dump_zap_width = sizeof (dump_zap_stars) - 1;
+
+static void
+dump_zap_histogram(uint64_t histo[ZAP_HISTOGRAM_SIZE])
+{
+	int i;
+	int minidx = ZAP_HISTOGRAM_SIZE - 1;
+	int maxidx = 0;
+	uint64_t max = 0;
+
+	for (i = 0; i < ZAP_HISTOGRAM_SIZE; i++) {
+		if (histo[i] > max)
+			max = histo[i];
+		if (histo[i] > 0 && i > maxidx)
+			maxidx = i;
+		if (histo[i] > 0 && i < minidx)
+			minidx = i;
+	}
+
+	if (max < dump_zap_width)
+		max = dump_zap_width;
+
+	for (i = minidx; i <= maxidx; i++)
+		(void) printf("\t\t\t%u: %6llu %s\n", i, (u_longlong_t)histo[i],
+		    &dump_zap_stars[(max - histo[i]) * dump_zap_width / max]);
+}
+
+static void
+dump_zap_stats(objset_t *os, uint64_t object)
+{
+	int error;
+	zap_stats_t zs;
+
+	error = zap_get_stats(os, object, &zs);
+	if (error)
+		return;
+
+	if (zs.zs_ptrtbl_len == 0) {
+		ASSERT(zs.zs_num_blocks == 1);
+		(void) printf("\tmicrozap: %llu bytes, %llu entries\n",
+		    (u_longlong_t)zs.zs_blocksize,
+		    (u_longlong_t)zs.zs_num_entries);
+		return;
+	}
+
+	(void) printf("\tFat ZAP stats:\n");
+
+	(void) printf("\t\tPointer table:\n");
+	(void) printf("\t\t\t%llu elements\n",
+	    (u_longlong_t)zs.zs_ptrtbl_len);
+	(void) printf("\t\t\tzt_blk: %llu\n",
+	    (u_longlong_t)zs.zs_ptrtbl_zt_blk);
+	(void) printf("\t\t\tzt_numblks: %llu\n",
+	    (u_longlong_t)zs.zs_ptrtbl_zt_numblks);
+	(void) printf("\t\t\tzt_shift: %llu\n",
+	    (u_longlong_t)zs.zs_ptrtbl_zt_shift);
+	(void) printf("\t\t\tzt_blks_copied: %llu\n",
+	    (u_longlong_t)zs.zs_ptrtbl_blks_copied);
+	(void) printf("\t\t\tzt_nextblk: %llu\n",
+	    (u_longlong_t)zs.zs_ptrtbl_nextblk);
+
+	(void) printf("\t\tZAP entries: %llu\n",
+	    (u_longlong_t)zs.zs_num_entries);
+	(void) printf("\t\tLeaf blocks: %llu\n",
+	    (u_longlong_t)zs.zs_num_leafs);
+	(void) printf("\t\tTotal blocks: %llu\n",
+	    (u_longlong_t)zs.zs_num_blocks);
+	(void) printf("\t\tzap_block_type: 0x%llx\n",
+	    (u_longlong_t)zs.zs_block_type);
+	(void) printf("\t\tzap_magic: 0x%llx\n",
+	    (u_longlong_t)zs.zs_magic);
+	(void) printf("\t\tzap_salt: 0x%llx\n",
+	    (u_longlong_t)zs.zs_salt);
+
+	(void) printf("\t\tLeafs with 2^n pointers:\n");
+	dump_zap_histogram(zs.zs_leafs_with_2n_pointers);
+
+	(void) printf("\t\tBlocks with n*5 entries:\n");
+	dump_zap_histogram(zs.zs_blocks_with_n5_entries);
+
+	(void) printf("\t\tBlocks n/10 full:\n");
+	dump_zap_histogram(zs.zs_blocks_n_tenths_full);
+
+	(void) printf("\t\tEntries with n chunks:\n");
+	dump_zap_histogram(zs.zs_entries_using_n_chunks);
+
+	(void) printf("\t\tBuckets with n entries:\n");
+	dump_zap_histogram(zs.zs_buckets_with_n_entries);
+}
+
+/*ARGSUSED*/
+static void
+dump_none(objset_t *os, uint64_t object, void *data, size_t size)
+{
+}
+
+/*ARGSUSED*/
+void
+dump_uint8(objset_t *os, uint64_t object, void *data, size_t size)
+{
+}
+
+/*ARGSUSED*/
+static void
+dump_uint64(objset_t *os, uint64_t object, void *data, size_t size)
+{
+}
+
+/*ARGSUSED*/
+static void
+dump_zap(objset_t *os, uint64_t object, void *data, size_t size)
+{
+	zap_cursor_t zc;
+	zap_attribute_t attr;
+	void *prop;
+	int i;
+
+	dump_zap_stats(os, object);
+	(void) printf("\n");
+
+	for (zap_cursor_init(&zc, os, object);
+	    zap_cursor_retrieve(&zc, &attr) == 0;
+	    zap_cursor_advance(&zc)) {
+		(void) printf("\t\t%s = ", attr.za_name);
+		if (attr.za_num_integers == 0) {
+			(void) printf("\n");
+			continue;
+		}
+		prop = umem_zalloc(attr.za_num_integers *
+		    attr.za_integer_length, UMEM_NOFAIL);
+		(void) zap_lookup(os, object, attr.za_name,
+		    attr.za_integer_length, attr.za_num_integers, prop);
+		if (attr.za_integer_length == 1) {
+			(void) printf("%s", (char *)prop);
+		} else {
+			for (i = 0; i < attr.za_num_integers; i++) {
+				switch (attr.za_integer_length) {
+				case 2:
+					(void) printf("%u ",
+					    ((uint16_t *)prop)[i]);
+					break;
+				case 4:
+					(void) printf("%u ",
+					    ((uint32_t *)prop)[i]);
+					break;
+				case 8:
+					(void) printf("%lld ",
+					    (u_longlong_t)((int64_t *)prop)[i]);
+					break;
+				}
+			}
+		}
+		(void) printf("\n");
+		umem_free(prop, attr.za_num_integers * attr.za_integer_length);
+	}
+	zap_cursor_fini(&zc);
+}
+
+/*ARGSUSED*/
+static void
+dump_zpldir(objset_t *os, uint64_t object, void *data, size_t size)
+{
+	zap_cursor_t zc;
+	zap_attribute_t attr;
+	const char *typenames[] = {
+		/* 0 */ "not specified",
+		/* 1 */ "FIFO",
+		/* 2 */ "Character Device",
+		/* 3 */ "3 (invalid)",
+		/* 4 */ "Directory",
+		/* 5 */ "5 (invalid)",
+		/* 6 */ "Block Device",
+		/* 7 */ "7 (invalid)",
+		/* 8 */ "Regular File",
+		/* 9 */ "9 (invalid)",
+		/* 10 */ "Symbolic Link",
+		/* 11 */ "11 (invalid)",
+		/* 12 */ "Socket",
+		/* 13 */ "Door",
+		/* 14 */ "Event Port",
+		/* 15 */ "15 (invalid)",
+	};
+
+	dump_zap_stats(os, object);
+	(void) printf("\n");
+
+	for (zap_cursor_init(&zc, os, object);
+	    zap_cursor_retrieve(&zc, &attr) == 0;
+	    zap_cursor_advance(&zc)) {
+		(void) printf("\t\t%s = %lld (type: %s)\n",
+		    attr.za_name, ZFS_DIRENT_OBJ(attr.za_first_integer),
+		    typenames[ZFS_DIRENT_TYPE(attr.za_first_integer)]);
+	}
+	zap_cursor_fini(&zc);
+}
+
+static void
+dump_spacemap(objset_t *os, space_map_obj_t *smo, space_map_t *sm)
+{
+	uint64_t alloc, offset, entry;
+	uint8_t mapshift = sm->sm_shift;
+	uint64_t mapstart = sm->sm_start;
+	char *ddata[] = { "ALLOC", "FREE", "CONDENSE", "INVALID",
+			    "INVALID", "INVALID", "INVALID", "INVALID" };
+
+	if (smo->smo_object == 0)
+		return;
+
+	/*
+	 * Print out the freelist entries in both encoded and decoded form.
+	 */
+	alloc = 0;
+	for (offset = 0; offset < smo->smo_objsize; offset += sizeof (entry)) {
+		VERIFY(0 == dmu_read(os, smo->smo_object, offset,
+		    sizeof (entry), &entry));
+		if (SM_DEBUG_DECODE(entry)) {
+			(void) printf("\t\t[%4llu] %s: txg %llu, pass %llu\n",
+			    (u_longlong_t)(offset / sizeof (entry)),
+			    ddata[SM_DEBUG_ACTION_DECODE(entry)],
+			    (u_longlong_t)SM_DEBUG_TXG_DECODE(entry),
+			    (u_longlong_t)SM_DEBUG_SYNCPASS_DECODE(entry));
+		} else {
+			(void) printf("\t\t[%4llu]    %c  range:"
+			    " %08llx-%08llx  size: %06llx\n",
+			    (u_longlong_t)(offset / sizeof (entry)),
+			    SM_TYPE_DECODE(entry) == SM_ALLOC ? 'A' : 'F',
+			    (u_longlong_t)((SM_OFFSET_DECODE(entry) <<
+			    mapshift) + mapstart),
+			    (u_longlong_t)((SM_OFFSET_DECODE(entry) <<
+			    mapshift) + mapstart + (SM_RUN_DECODE(entry) <<
+			    mapshift)),
+			    (u_longlong_t)(SM_RUN_DECODE(entry) << mapshift));
+			if (SM_TYPE_DECODE(entry) == SM_ALLOC)
+				alloc += SM_RUN_DECODE(entry) << mapshift;
+			else
+				alloc -= SM_RUN_DECODE(entry) << mapshift;
+		}
+	}
+	if (alloc != smo->smo_alloc) {
+		(void) printf("space_map_object alloc (%llu) INCONSISTENT "
+		    "with space map summary (%llu)\n",
+		    (u_longlong_t)smo->smo_alloc, (u_longlong_t)alloc);
+	}
+}
+
+static void
+dump_metaslab(metaslab_t *msp)
+{
+	char freebuf[5];
+	space_map_obj_t *smo = &msp->ms_smo;
+	vdev_t *vd = msp->ms_group->mg_vd;
+	spa_t *spa = vd->vdev_spa;
+
+	nicenum(msp->ms_map.sm_size - smo->smo_alloc, freebuf);
+
+	if (dump_opt['d'] <= 5) {
+		(void) printf("\t%10llx   %10llu   %5s\n",
+		    (u_longlong_t)msp->ms_map.sm_start,
+		    (u_longlong_t)smo->smo_object,
+		    freebuf);
+		return;
+	}
+
+	(void) printf(
+	    "\tvdev %llu   offset %08llx   spacemap %4llu   free %5s\n",
+	    (u_longlong_t)vd->vdev_id, (u_longlong_t)msp->ms_map.sm_start,
+	    (u_longlong_t)smo->smo_object, freebuf);
+
+	ASSERT(msp->ms_map.sm_size == (1ULL << vd->vdev_ms_shift));
+
+	dump_spacemap(spa->spa_meta_objset, smo, &msp->ms_map);
+}
+
+static void
+dump_metaslabs(spa_t *spa)
+{
+	vdev_t *rvd = spa->spa_root_vdev;
+	vdev_t *vd;
+	int c, m;
+
+	(void) printf("\nMetaslabs:\n");
+
+	for (c = 0; c < rvd->vdev_children; c++) {
+		vd = rvd->vdev_child[c];
+
+		(void) printf("\n    vdev %llu\n\n", (u_longlong_t)vd->vdev_id);
+
+		if (dump_opt['d'] <= 5) {
+			(void) printf("\t%10s   %10s   %5s\n",
+			    "offset", "spacemap", "free");
+			(void) printf("\t%10s   %10s   %5s\n",
+			    "------", "--------", "----");
+		}
+		for (m = 0; m < vd->vdev_ms_count; m++)
+			dump_metaslab(vd->vdev_ms[m]);
+		(void) printf("\n");
+	}
+}
+
+static void
+dump_dtl(vdev_t *vd, int indent)
+{
+	avl_tree_t *t = &vd->vdev_dtl_map.sm_root;
+	space_seg_t *ss;
+	vdev_t *pvd;
+	int c;
+
+	if (indent == 0)
+		(void) printf("\nDirty time logs:\n\n");
+
+	(void) printf("\t%*s%s\n", indent, "",
+	    vd->vdev_path ? vd->vdev_path :
+	    vd->vdev_parent ? vd->vdev_ops->vdev_op_type :
+	    spa_name(vd->vdev_spa));
+
+	for (ss = avl_first(t); ss; ss = AVL_NEXT(t, ss)) {
+		/*
+		 * Everything in this DTL must appear in all parent DTL unions.
+		 */
+		for (pvd = vd; pvd; pvd = pvd->vdev_parent)
+			ASSERT(vdev_dtl_contains(&pvd->vdev_dtl_map,
+			    ss->ss_start, ss->ss_end - ss->ss_start));
+		(void) printf("\t%*soutage [%llu,%llu] length %llu\n",
+		    indent, "",
+		    (u_longlong_t)ss->ss_start,
+		    (u_longlong_t)ss->ss_end - 1,
+		    (u_longlong_t)(ss->ss_end - ss->ss_start));
+	}
+
+	(void) printf("\n");
+
+	if (dump_opt['d'] > 5 && vd->vdev_children == 0) {
+		dump_spacemap(vd->vdev_spa->spa_meta_objset, &vd->vdev_dtl,
+		    &vd->vdev_dtl_map);
+		(void) printf("\n");
+	}
+
+	for (c = 0; c < vd->vdev_children; c++)
+		dump_dtl(vd->vdev_child[c], indent + 4);
+}
+
+/*ARGSUSED*/
+static void
+dump_dnode(objset_t *os, uint64_t object, void *data, size_t size)
+{
+}
+
+static uint64_t
+blkid2offset(const dnode_phys_t *dnp, int level, uint64_t blkid)
+{
+	if (level < 0)
+		return (blkid);
+
+	return ((blkid << (level * (dnp->dn_indblkshift - SPA_BLKPTRSHIFT))) *
+	    dnp->dn_datablkszsec << SPA_MINBLOCKSHIFT);
+}
+
+static void
+sprintf_blkptr_compact(char *blkbuf, blkptr_t *bp, int alldvas)
+{
+	dva_t *dva = bp->blk_dva;
+	int ndvas = alldvas ? BP_GET_NDVAS(bp) : 1;
+	int i;
+
+	blkbuf[0] = '\0';
+
+	for (i = 0; i < ndvas; i++)
+		(void) sprintf(blkbuf + strlen(blkbuf), "%llu:%llx:%llx ",
+		    (u_longlong_t)DVA_GET_VDEV(&dva[i]),
+		    (u_longlong_t)DVA_GET_OFFSET(&dva[i]),
+		    (u_longlong_t)DVA_GET_ASIZE(&dva[i]));
+
+	(void) sprintf(blkbuf + strlen(blkbuf), "%llxL/%llxP F=%llu B=%llu",
+	    (u_longlong_t)BP_GET_LSIZE(bp),
+	    (u_longlong_t)BP_GET_PSIZE(bp),
+	    (u_longlong_t)bp->blk_fill,
+	    (u_longlong_t)bp->blk_birth);
+}
+
+static void
+print_indirect(blkptr_t *bp, const zbookmark_t *zb,
+    const dnode_phys_t *dnp)
+{
+	char blkbuf[BP_SPRINTF_LEN];
+	int l;
+
+	ASSERT3U(BP_GET_TYPE(bp), ==, dnp->dn_type);
+	ASSERT3U(BP_GET_LEVEL(bp), ==, zb->zb_level);
+
+	(void) printf("%16llx ",
+	    (u_longlong_t)blkid2offset(dnp, zb->zb_level, zb->zb_blkid));
+
+	ASSERT(zb->zb_level >= 0);
+
+	for (l = dnp->dn_nlevels - 1; l >= -1; l--) {
+		if (l == zb->zb_level) {
+			(void) printf("L%llx", (u_longlong_t)zb->zb_level);
+		} else {
+			(void) printf(" ");
+		}
+	}
+
+	sprintf_blkptr_compact(blkbuf, bp, dump_opt['d'] > 5 ? 1 : 0);
+	(void) printf("%s\n", blkbuf);
+}
+
+#define	SET_BOOKMARK(zb, objset, object, level, blkid)  \
+{                                                       \
+	(zb)->zb_objset = objset;                       \
+	(zb)->zb_object = object;                       \
+	(zb)->zb_level = level;                         \
+	(zb)->zb_blkid = blkid;                         \
+}
+
+static int
+visit_indirect(spa_t *spa, const dnode_phys_t *dnp,
+    blkptr_t *bp, const zbookmark_t *zb)
+{
+	int err;
+
+	if (bp->blk_birth == 0)
+		return (0);
+
+	print_indirect(bp, zb, dnp);
+
+	if (BP_GET_LEVEL(bp) > 0) {
+		uint32_t flags = ARC_WAIT;
+		int i;
+		blkptr_t *cbp;
+		int epb = BP_GET_LSIZE(bp) >> SPA_BLKPTRSHIFT;
+		arc_buf_t *buf;
+		uint64_t fill = 0;
+
+		err = arc_read_nolock(NULL, spa, bp, arc_getbuf_func, &buf,
+		    ZIO_PRIORITY_ASYNC_READ, ZIO_FLAG_CANFAIL, &flags, zb);
+		if (err)
+			return (err);
+
+		/* recursively visit blocks below this */
+		cbp = buf->b_data;
+		for (i = 0; i < epb; i++, cbp++) {
+			zbookmark_t czb;
+
+			SET_BOOKMARK(&czb, zb->zb_objset, zb->zb_object,
+			    zb->zb_level - 1,
+			    zb->zb_blkid * epb + i);
+			err = visit_indirect(spa, dnp, cbp, &czb);
+			if (err)
+				break;
+			fill += cbp->blk_fill;
+		}
+		ASSERT3U(fill, ==, bp->blk_fill);
+		(void) arc_buf_remove_ref(buf, &buf);
+	}
+
+	return (err);
+}
+
+/*ARGSUSED*/
+static void
+dump_indirect(dnode_t *dn)
+{
+	dnode_phys_t *dnp = dn->dn_phys;
+	int j;
+	zbookmark_t czb;
+
+	(void) printf("Indirect blocks:\n");
+
+	SET_BOOKMARK(&czb, dmu_objset_id(&dn->dn_objset->os),
+	    dn->dn_object, dnp->dn_nlevels - 1, 0);
+	for (j = 0; j < dnp->dn_nblkptr; j++) {
+		czb.zb_blkid = j;
+		(void) visit_indirect(dmu_objset_spa(&dn->dn_objset->os), dnp,
+		    &dnp->dn_blkptr[j], &czb);
+	}
+
+	(void) printf("\n");
+}
+
+/*ARGSUSED*/
+static void
+dump_dsl_dir(objset_t *os, uint64_t object, void *data, size_t size)
+{
+	dsl_dir_phys_t *dd = data;
+	time_t crtime;
+	char nice[6];
+
+	if (dd == NULL)
+		return;
+
+	ASSERT3U(size, >=, sizeof (dsl_dir_phys_t));
+
+	crtime = dd->dd_creation_time;
+	(void) printf("\t\tcreation_time = %s", ctime(&crtime));
+	(void) printf("\t\thead_dataset_obj = %llu\n",
+	    (u_longlong_t)dd->dd_head_dataset_obj);
+	(void) printf("\t\tparent_dir_obj = %llu\n",
+	    (u_longlong_t)dd->dd_parent_obj);
+	(void) printf("\t\torigin_obj = %llu\n",
+	    (u_longlong_t)dd->dd_origin_obj);
+	(void) printf("\t\tchild_dir_zapobj = %llu\n",
+	    (u_longlong_t)dd->dd_child_dir_zapobj);
+	nicenum(dd->dd_used_bytes, nice);
+	(void) printf("\t\tused_bytes = %s\n", nice);
+	nicenum(dd->dd_compressed_bytes, nice);
+	(void) printf("\t\tcompressed_bytes = %s\n", nice);
+	nicenum(dd->dd_uncompressed_bytes, nice);
+	(void) printf("\t\tuncompressed_bytes = %s\n", nice);
+	nicenum(dd->dd_quota, nice);
+	(void) printf("\t\tquota = %s\n", nice);
+	nicenum(dd->dd_reserved, nice);
+	(void) printf("\t\treserved = %s\n", nice);
+	(void) printf("\t\tprops_zapobj = %llu\n",
+	    (u_longlong_t)dd->dd_props_zapobj);
+	(void) printf("\t\tdeleg_zapobj = %llu\n",
+	    (u_longlong_t)dd->dd_deleg_zapobj);
+	(void) printf("\t\tflags = %llx\n",
+	    (u_longlong_t)dd->dd_flags);
+
+#define	DO(which) \
+	nicenum(dd->dd_used_breakdown[DD_USED_ ## which], nice); \
+	(void) printf("\t\tused_breakdown[" #which "] = %s\n", nice)
+	DO(HEAD);
+	DO(SNAP);
+	DO(CHILD);
+	DO(CHILD_RSRV);
+	DO(REFRSRV);
+#undef DO
+}
+
+/*ARGSUSED*/
+static void
+dump_dsl_dataset(objset_t *os, uint64_t object, void *data, size_t size)
+{
+	dsl_dataset_phys_t *ds = data;
+	time_t crtime;
+	char used[6], compressed[6], uncompressed[6], unique[6];
+	char blkbuf[BP_SPRINTF_LEN];
+
+	if (ds == NULL)
+		return;
+
+	ASSERT(size == sizeof (*ds));
+	crtime = ds->ds_creation_time;
+	nicenum(ds->ds_used_bytes, used);
+	nicenum(ds->ds_compressed_bytes, compressed);
+	nicenum(ds->ds_uncompressed_bytes, uncompressed);
+	nicenum(ds->ds_unique_bytes, unique);
+	sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, &ds->ds_bp);
+
+	(void) printf("\t\tdir_obj = %llu\n",
+	    (u_longlong_t)ds->ds_dir_obj);
+	(void) printf("\t\tprev_snap_obj = %llu\n",
+	    (u_longlong_t)ds->ds_prev_snap_obj);
+	(void) printf("\t\tprev_snap_txg = %llu\n",
+	    (u_longlong_t)ds->ds_prev_snap_txg);
+	(void) printf("\t\tnext_snap_obj = %llu\n",
+	    (u_longlong_t)ds->ds_next_snap_obj);
+	(void) printf("\t\tsnapnames_zapobj = %llu\n",
+	    (u_longlong_t)ds->ds_snapnames_zapobj);
+	(void) printf("\t\tnum_children = %llu\n",
+	    (u_longlong_t)ds->ds_num_children);
+	(void) printf("\t\tcreation_time = %s", ctime(&crtime));
+	(void) printf("\t\tcreation_txg = %llu\n",
+	    (u_longlong_t)ds->ds_creation_txg);
+	(void) printf("\t\tdeadlist_obj = %llu\n",
+	    (u_longlong_t)ds->ds_deadlist_obj);
+	(void) printf("\t\tused_bytes = %s\n", used);
+	(void) printf("\t\tcompressed_bytes = %s\n", compressed);
+	(void) printf("\t\tuncompressed_bytes = %s\n", uncompressed);
+	(void) printf("\t\tunique = %s\n", unique);
+	(void) printf("\t\tfsid_guid = %llu\n",
+	    (u_longlong_t)ds->ds_fsid_guid);
+	(void) printf("\t\tguid = %llu\n",
+	    (u_longlong_t)ds->ds_guid);
+	(void) printf("\t\tflags = %llx\n",
+	    (u_longlong_t)ds->ds_flags);
+	(void) printf("\t\tnext_clones_obj = %llu\n",
+	    (u_longlong_t)ds->ds_next_clones_obj);
+	(void) printf("\t\tprops_obj = %llu\n",
+	    (u_longlong_t)ds->ds_props_obj);
+	(void) printf("\t\tbp = %s\n", blkbuf);
+}
+
+static void
+dump_bplist(objset_t *mos, uint64_t object, char *name)
+{
+	bplist_t bpl = { 0 };
+	blkptr_t blk, *bp = &blk;
+	uint64_t itor = 0;
+	char bytes[6];
+	char comp[6];
+	char uncomp[6];
+
+	if (dump_opt['d'] < 3)
+		return;
+
+	mutex_init(&bpl.bpl_lock, NULL, MUTEX_DEFAULT, NULL);
+	VERIFY(0 == bplist_open(&bpl, mos, object));
+	if (bplist_empty(&bpl)) {
+		bplist_close(&bpl);
+		mutex_destroy(&bpl.bpl_lock);
+		return;
+	}
+
+	nicenum(bpl.bpl_phys->bpl_bytes, bytes);
+	if (bpl.bpl_dbuf->db_size == sizeof (bplist_phys_t)) {
+		nicenum(bpl.bpl_phys->bpl_comp, comp);
+		nicenum(bpl.bpl_phys->bpl_uncomp, uncomp);
+		(void) printf("\n    %s: %llu entries, %s (%s/%s comp)\n",
+		    name, (u_longlong_t)bpl.bpl_phys->bpl_entries,
+		    bytes, comp, uncomp);
+	} else {
+		(void) printf("\n    %s: %llu entries, %s\n",
+		    name, (u_longlong_t)bpl.bpl_phys->bpl_entries, bytes);
+	}
+
+	if (dump_opt['d'] < 5) {
+		bplist_close(&bpl);
+		mutex_destroy(&bpl.bpl_lock);
+		return;
+	}
+
+	(void) printf("\n");
+
+	while (bplist_iterate(&bpl, &itor, bp) == 0) {
+		char blkbuf[BP_SPRINTF_LEN];
+
+		ASSERT(bp->blk_birth != 0);
+		sprintf_blkptr_compact(blkbuf, bp, dump_opt['d'] > 5 ? 1 : 0);
+		(void) printf("\tItem %3llu: %s\n",
+		    (u_longlong_t)itor - 1, blkbuf);
+	}
+
+	bplist_close(&bpl);
+	mutex_destroy(&bpl.bpl_lock);
+}
+
+static avl_tree_t idx_tree;
+static avl_tree_t domain_tree;
+static boolean_t fuid_table_loaded;
+
+static void
+fuid_table_destroy()
+{
+	if (fuid_table_loaded) {
+		zfs_fuid_table_destroy(&idx_tree, &domain_tree);
+		fuid_table_loaded = B_FALSE;
+	}
+}
+
+/*
+ * print uid or gid information.
+ * For normal POSIX id just the id is printed in decimal format.
+ * For CIFS files with FUID the fuid is printed in hex followed by
+ * the doman-rid string.
+ */
+static void
+print_idstr(uint64_t id, const char *id_type)
+{
+	if (FUID_INDEX(id)) {
+		char *domain;
+
+		domain = zfs_fuid_idx_domain(&idx_tree, FUID_INDEX(id));
+		(void) printf("\t%s     %llx [%s-%d]\n", id_type,
+		    (u_longlong_t)id, domain, (int)FUID_RID(id));
+	} else {
+		(void) printf("\t%s     %llu\n", id_type, (u_longlong_t)id);
+	}
+
+}
+
+static void
+dump_uidgid(objset_t *os, znode_phys_t *zp)
+{
+	uint32_t uid_idx, gid_idx;
+
+	uid_idx = FUID_INDEX(zp->zp_uid);
+	gid_idx = FUID_INDEX(zp->zp_gid);
+
+	/* Load domain table, if not already loaded */
+	if (!fuid_table_loaded && (uid_idx || gid_idx)) {
+		uint64_t fuid_obj;
+
+		/* first find the fuid object.  It lives in the master node */
+		VERIFY(zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES,
+		    8, 1, &fuid_obj) == 0);
+		(void) zfs_fuid_table_load(os, fuid_obj,
+		    &idx_tree, &domain_tree);
+		fuid_table_loaded = B_TRUE;
+	}
+
+	print_idstr(zp->zp_uid, "uid");
+	print_idstr(zp->zp_gid, "gid");
+}
+
+/*ARGSUSED*/
+static void
+dump_znode(objset_t *os, uint64_t object, void *data, size_t size)
+{
+	znode_phys_t *zp = data;
+	time_t z_crtime, z_atime, z_mtime, z_ctime;
+	char path[MAXPATHLEN * 2];	/* allow for xattr and failure prefix */
+	int error;
+
+	ASSERT(size >= sizeof (znode_phys_t));
+
+	error = zfs_obj_to_path(os, object, path, sizeof (path));
+	if (error != 0) {
+		(void) snprintf(path, sizeof (path), "\?\?\?<object#%llu>",
+		    (u_longlong_t)object);
+	}
+
+	if (dump_opt['d'] < 3) {
+		(void) printf("\t%s\n", path);
+		return;
+	}
+
+	z_crtime = (time_t)zp->zp_crtime[0];
+	z_atime = (time_t)zp->zp_atime[0];
+	z_mtime = (time_t)zp->zp_mtime[0];
+	z_ctime = (time_t)zp->zp_ctime[0];
+
+	(void) printf("\tpath	%s\n", path);
+	dump_uidgid(os, zp);
+	(void) printf("\tatime	%s", ctime(&z_atime));
+	(void) printf("\tmtime	%s", ctime(&z_mtime));
+	(void) printf("\tctime	%s", ctime(&z_ctime));
+	(void) printf("\tcrtime	%s", ctime(&z_crtime));
+	(void) printf("\tgen	%llu\n", (u_longlong_t)zp->zp_gen);
+	(void) printf("\tmode	%llo\n", (u_longlong_t)zp->zp_mode);
+	(void) printf("\tsize	%llu\n", (u_longlong_t)zp->zp_size);
+	(void) printf("\tparent	%llu\n", (u_longlong_t)zp->zp_parent);
+	(void) printf("\tlinks	%llu\n", (u_longlong_t)zp->zp_links);
+	(void) printf("\txattr	%llu\n", (u_longlong_t)zp->zp_xattr);
+	(void) printf("\trdev	0x%016llx\n", (u_longlong_t)zp->zp_rdev);
+}
+
+/*ARGSUSED*/
+static void
+dump_acl(objset_t *os, uint64_t object, void *data, size_t size)
+{
+}
+
+/*ARGSUSED*/
+static void
+dump_dmu_objset(objset_t *os, uint64_t object, void *data, size_t size)
+{
+}
+
+static object_viewer_t *object_viewer[DMU_OT_NUMTYPES] = {
+	dump_none,		/* unallocated			*/
+	dump_zap,		/* object directory		*/
+	dump_uint64,		/* object array			*/
+	dump_none,		/* packed nvlist		*/
+	dump_packed_nvlist,	/* packed nvlist size		*/
+	dump_none,		/* bplist			*/
+	dump_none,		/* bplist header		*/
+	dump_none,		/* SPA space map header		*/
+	dump_none,		/* SPA space map		*/
+	dump_none,		/* ZIL intent log		*/
+	dump_dnode,		/* DMU dnode			*/
+	dump_dmu_objset,	/* DMU objset			*/
+	dump_dsl_dir,		/* DSL directory		*/
+	dump_zap,		/* DSL directory child map	*/
+	dump_zap,		/* DSL dataset snap map		*/
+	dump_zap,		/* DSL props			*/
+	dump_dsl_dataset,	/* DSL dataset			*/
+	dump_znode,		/* ZFS znode			*/
+	dump_acl,		/* ZFS V0 ACL			*/
+	dump_uint8,		/* ZFS plain file		*/
+	dump_zpldir,		/* ZFS directory		*/
+	dump_zap,		/* ZFS master node		*/
+	dump_zap,		/* ZFS delete queue		*/
+	dump_uint8,		/* zvol object			*/
+	dump_zap,		/* zvol prop			*/
+	dump_uint8,		/* other uint8[]		*/
+	dump_uint64,		/* other uint64[]		*/
+	dump_zap,		/* other ZAP			*/
+	dump_zap,		/* persistent error log		*/
+	dump_uint8,		/* SPA history			*/
+	dump_uint64,		/* SPA history offsets		*/
+	dump_zap,		/* Pool properties		*/
+	dump_zap,		/* DSL permissions		*/
+	dump_acl,		/* ZFS ACL			*/
+	dump_uint8,		/* ZFS SYSACL			*/
+	dump_none,		/* FUID nvlist			*/
+	dump_packed_nvlist,	/* FUID nvlist size		*/
+	dump_zap,		/* DSL dataset next clones	*/
+	dump_zap,		/* DSL scrub queue		*/
+};
+
+static void
+dump_object(objset_t *os, uint64_t object, int verbosity, int *print_header)
+{
+	dmu_buf_t *db = NULL;
+	dmu_object_info_t doi;
+	dnode_t *dn;
+	void *bonus = NULL;
+	size_t bsize = 0;
+	char iblk[6], dblk[6], lsize[6], asize[6], bonus_size[6], segsize[6];
+	char aux[50];
+	int error;
+
+	if (*print_header) {
+		(void) printf("\n    Object  lvl   iblk   dblk  lsize"
+		    "  asize  type\n");
+		*print_header = 0;
+	}
+
+	if (object == 0) {
+		dn = os->os->os_meta_dnode;
+	} else {
+		error = dmu_bonus_hold(os, object, FTAG, &db);
+		if (error)
+			fatal("dmu_bonus_hold(%llu) failed, errno %u",
+			    object, error);
+		bonus = db->db_data;
+		bsize = db->db_size;
+		dn = ((dmu_buf_impl_t *)db)->db_dnode;
+	}
+	dmu_object_info_from_dnode(dn, &doi);
+
+	nicenum(doi.doi_metadata_block_size, iblk);
+	nicenum(doi.doi_data_block_size, dblk);
+	nicenum(doi.doi_data_block_size * (doi.doi_max_block_offset + 1),
+	    lsize);
+	nicenum(doi.doi_physical_blks << 9, asize);
+	nicenum(doi.doi_bonus_size, bonus_size);
+
+	aux[0] = '\0';
+
+	if (doi.doi_checksum != ZIO_CHECKSUM_INHERIT || verbosity >= 6) {
+		(void) snprintf(aux + strlen(aux), sizeof (aux), " (K=%s)",
+		    zio_checksum_table[doi.doi_checksum].ci_name);
+	}
+
+	if (doi.doi_compress != ZIO_COMPRESS_INHERIT || verbosity >= 6) {
+		(void) snprintf(aux + strlen(aux), sizeof (aux), " (Z=%s)",
+		    zio_compress_table[doi.doi_compress].ci_name);
+	}
+
+	(void) printf("%10lld  %3u  %5s  %5s  %5s  %5s  %s%s\n",
+	    (u_longlong_t)object, doi.doi_indirection, iblk, dblk, lsize,
+	    asize, dmu_ot[doi.doi_type].ot_name, aux);
+
+	if (doi.doi_bonus_type != DMU_OT_NONE && verbosity > 3) {
+		(void) printf("%10s  %3s  %5s  %5s  %5s  %5s  %s\n",
+		    "", "", "", "", bonus_size, "bonus",
+		    dmu_ot[doi.doi_bonus_type].ot_name);
+	}
+
+	if (verbosity >= 4) {
+		object_viewer[doi.doi_bonus_type](os, object, bonus, bsize);
+		object_viewer[doi.doi_type](os, object, NULL, 0);
+		*print_header = 1;
+	}
+
+	if (verbosity >= 5)
+		dump_indirect(dn);
+
+	if (verbosity >= 5) {
+		/*
+		 * Report the list of segments that comprise the object.
+		 */
+		uint64_t start = 0;
+		uint64_t end;
+		uint64_t blkfill = 1;
+		int minlvl = 1;
+
+		if (dn->dn_type == DMU_OT_DNODE) {
+			minlvl = 0;
+			blkfill = DNODES_PER_BLOCK;
+		}
+
+		for (;;) {
+			error = dnode_next_offset(dn,
+			    0, &start, minlvl, blkfill, 0);
+			if (error)
+				break;
+			end = start;
+			error = dnode_next_offset(dn,
+			    DNODE_FIND_HOLE, &end, minlvl, blkfill, 0);
+			nicenum(end - start, segsize);
+			(void) printf("\t\tsegment [%016llx, %016llx)"
+			    " size %5s\n", (u_longlong_t)start,
+			    (u_longlong_t)end, segsize);
+			if (error)
+				break;
+			start = end;
+		}
+	}
+
+	if (db != NULL)
+		dmu_buf_rele(db, FTAG);
+}
+
+static char *objset_types[DMU_OST_NUMTYPES] = {
+	"NONE", "META", "ZPL", "ZVOL", "OTHER", "ANY" };
+
+static void
+dump_dir(objset_t *os)
+{
+	dmu_objset_stats_t dds;
+	uint64_t object, object_count;
+	uint64_t refdbytes, usedobjs, scratch;
+	char numbuf[8];
+	char blkbuf[BP_SPRINTF_LEN];
+	char osname[MAXNAMELEN];
+	char *type = "UNKNOWN";
+	int verbosity = dump_opt['d'];
+	int print_header = 1;
+	int i, error;
+
+	dmu_objset_fast_stat(os, &dds);
+
+	if (dds.dds_type < DMU_OST_NUMTYPES)
+		type = objset_types[dds.dds_type];
+
+	if (dds.dds_type == DMU_OST_META) {
+		dds.dds_creation_txg = TXG_INITIAL;
+		usedobjs = os->os->os_rootbp->blk_fill;
+		refdbytes = os->os->os_spa->spa_dsl_pool->
+		    dp_mos_dir->dd_phys->dd_used_bytes;
+	} else {
+		dmu_objset_space(os, &refdbytes, &scratch, &usedobjs, &scratch);
+	}
+
+	ASSERT3U(usedobjs, ==, os->os->os_rootbp->blk_fill);
+
+	nicenum(refdbytes, numbuf);
+
+	if (verbosity >= 4) {
+		(void) strcpy(blkbuf, ", rootbp ");
+		sprintf_blkptr(blkbuf + strlen(blkbuf),
+		    BP_SPRINTF_LEN - strlen(blkbuf), os->os->os_rootbp);
+	} else {
+		blkbuf[0] = '\0';
+	}
+
+	dmu_objset_name(os, osname);
+
+	(void) printf("Dataset %s [%s], ID %llu, cr_txg %llu, "
+	    "%s, %llu objects%s\n",
+	    osname, type, (u_longlong_t)dmu_objset_id(os),
+	    (u_longlong_t)dds.dds_creation_txg,
+	    numbuf, (u_longlong_t)usedobjs, blkbuf);
+
+	dump_intent_log(dmu_objset_zil(os));
+
+	if (dmu_objset_ds(os) != NULL)
+		dump_bplist(dmu_objset_pool(os)->dp_meta_objset,
+		    dmu_objset_ds(os)->ds_phys->ds_deadlist_obj, "Deadlist");
+
+	if (verbosity < 2)
+		return;
+
+	if (os->os->os_rootbp->blk_birth == 0)
+		return;
+
+	if (zopt_objects != 0) {
+		for (i = 0; i < zopt_objects; i++)
+			dump_object(os, zopt_object[i], verbosity,
+			    &print_header);
+		(void) printf("\n");
+		return;
+	}
+
+	dump_object(os, 0, verbosity, &print_header);
+	object_count = 1;
+
+	object = 0;
+	while ((error = dmu_object_next(os, &object, B_FALSE, 0)) == 0) {
+		dump_object(os, object, verbosity, &print_header);
+		object_count++;
+	}
+
+	ASSERT3U(object_count, ==, usedobjs);
+
+	(void) printf("\n");
+
+	if (error != ESRCH)
+		fatal("dmu_object_next() = %d", error);
+}
+
+static void
+dump_uberblock(uberblock_t *ub)
+{
+	time_t timestamp = ub->ub_timestamp;
+
+	(void) printf("Uberblock\n\n");
+	(void) printf("\tmagic = %016llx\n", (u_longlong_t)ub->ub_magic);
+	(void) printf("\tversion = %llu\n", (u_longlong_t)ub->ub_version);
+	(void) printf("\ttxg = %llu\n", (u_longlong_t)ub->ub_txg);
+	(void) printf("\tguid_sum = %llu\n", (u_longlong_t)ub->ub_guid_sum);
+	(void) printf("\ttimestamp = %llu UTC = %s",
+	    (u_longlong_t)ub->ub_timestamp, asctime(localtime(&timestamp)));
+	if (dump_opt['u'] >= 3) {
+		char blkbuf[BP_SPRINTF_LEN];
+		sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, &ub->ub_rootbp);
+		(void) printf("\trootbp = %s\n", blkbuf);
+	}
+	(void) printf("\n");
+}
+
+static void
+dump_config(const char *pool)
+{
+	spa_t *spa = NULL;
+
+	mutex_enter(&spa_namespace_lock);
+	while ((spa = spa_next(spa)) != NULL) {
+		if (pool == NULL)
+			(void) printf("%s\n", spa_name(spa));
+		if (pool == NULL || strcmp(pool, spa_name(spa)) == 0)
+			dump_nvlist(spa->spa_config, 4);
+	}
+	mutex_exit(&spa_namespace_lock);
+}
+
+static void
+dump_cachefile(const char *cachefile)
+{
+	int fd;
+	struct stat64 statbuf;
+	char *buf;
+	nvlist_t *config;
+
+	if ((fd = open64(cachefile, O_RDONLY)) < 0) {
+		(void) printf("cannot open '%s': %s\n", cachefile,
+		    strerror(errno));
+		exit(1);
+	}
+
+	if (fstat64(fd, &statbuf) != 0) {
+		(void) printf("failed to stat '%s': %s\n", cachefile,
+		    strerror(errno));
+		exit(1);
+	}
+
+	if ((buf = malloc(statbuf.st_size)) == NULL) {
+		(void) fprintf(stderr, "failed to allocate %llu bytes\n",
+		    (u_longlong_t)statbuf.st_size);
+		exit(1);
+	}
+
+	if (read(fd, buf, statbuf.st_size) != statbuf.st_size) {
+		(void) fprintf(stderr, "failed to read %llu bytes\n",
+		    (u_longlong_t)statbuf.st_size);
+		exit(1);
+	}
+
+	(void) close(fd);
+
+	if (nvlist_unpack(buf, statbuf.st_size, &config, 0) != 0) {
+		(void) fprintf(stderr, "failed to unpack nvlist\n");
+		exit(1);
+	}
+
+	free(buf);
+
+	dump_nvlist(config, 0);
+
+	nvlist_free(config);
+}
+
+static void
+dump_label(const char *dev)
+{
+	int fd;
+	vdev_label_t label;
+	char *buf = label.vl_vdev_phys.vp_nvlist;
+	size_t buflen = sizeof (label.vl_vdev_phys.vp_nvlist);
+	struct stat64 statbuf;
+	uint64_t psize;
+	int l;
+
+	if ((fd = open64(dev, O_RDONLY)) < 0) {
+		(void) printf("cannot open '%s': %s\n", dev, strerror(errno));
+		exit(1);
+	}
+
+	if (fstat64(fd, &statbuf) != 0) {
+		(void) printf("failed to stat '%s': %s\n", dev,
+		    strerror(errno));
+		exit(1);
+	}
+
+	psize = statbuf.st_size;
+	psize = P2ALIGN(psize, (uint64_t)sizeof (vdev_label_t));
+
+	for (l = 0; l < VDEV_LABELS; l++) {
+
+		nvlist_t *config = NULL;
+
+		(void) printf("--------------------------------------------\n");
+		(void) printf("LABEL %d\n", l);
+		(void) printf("--------------------------------------------\n");
+
+		if (pread64(fd, &label, sizeof (label),
+		    vdev_label_offset(psize, l, 0)) != sizeof (label)) {
+			(void) printf("failed to read label %d\n", l);
+			continue;
+		}
+
+		if (nvlist_unpack(buf, buflen, &config, 0) != 0) {
+			(void) printf("failed to unpack label %d\n", l);
+			continue;
+		}
+		dump_nvlist(config, 4);
+		nvlist_free(config);
+	}
+}
+
+/*ARGSUSED*/
+static int
+dump_one_dir(char *dsname, void *arg)
+{
+	int error;
+	objset_t *os;
+
+	error = dmu_objset_open(dsname, DMU_OST_ANY,
+	    DS_MODE_USER | DS_MODE_READONLY, &os);
+	if (error) {
+		(void) printf("Could not open %s\n", dsname);
+		return (0);
+	}
+	dump_dir(os);
+	dmu_objset_close(os);
+	fuid_table_destroy();
+	return (0);
+}
+
+static void
+zdb_leak(space_map_t *sm, uint64_t start, uint64_t size)
+{
+	vdev_t *vd = sm->sm_ppd;
+
+	(void) printf("leaked space: vdev %llu, offset 0x%llx, size %llu\n",
+	    (u_longlong_t)vd->vdev_id, (u_longlong_t)start, (u_longlong_t)size);
+}
+
+/* ARGSUSED */
+static void
+zdb_space_map_load(space_map_t *sm)
+{
+}
+
+static void
+zdb_space_map_unload(space_map_t *sm)
+{
+	space_map_vacate(sm, zdb_leak, sm);
+}
+
+/* ARGSUSED */
+static void
+zdb_space_map_claim(space_map_t *sm, uint64_t start, uint64_t size)
+{
+}
+
+static space_map_ops_t zdb_space_map_ops = {
+	zdb_space_map_load,
+	zdb_space_map_unload,
+	NULL,	/* alloc */
+	zdb_space_map_claim,
+	NULL	/* free */
+};
+
+static void
+zdb_leak_init(spa_t *spa)
+{
+	vdev_t *rvd = spa->spa_root_vdev;
+
+	for (int c = 0; c < rvd->vdev_children; c++) {
+		vdev_t *vd = rvd->vdev_child[c];
+		for (int m = 0; m < vd->vdev_ms_count; m++) {
+			metaslab_t *msp = vd->vdev_ms[m];
+			mutex_enter(&msp->ms_lock);
+			VERIFY(space_map_load(&msp->ms_map, &zdb_space_map_ops,
+			    SM_ALLOC, &msp->ms_smo, spa->spa_meta_objset) == 0);
+			msp->ms_map.sm_ppd = vd;
+			mutex_exit(&msp->ms_lock);
+		}
+	}
+}
+
+static void
+zdb_leak_fini(spa_t *spa)
+{
+	vdev_t *rvd = spa->spa_root_vdev;
+
+	for (int c = 0; c < rvd->vdev_children; c++) {
+		vdev_t *vd = rvd->vdev_child[c];
+		for (int m = 0; m < vd->vdev_ms_count; m++) {
+			metaslab_t *msp = vd->vdev_ms[m];
+			mutex_enter(&msp->ms_lock);
+			space_map_unload(&msp->ms_map);
+			mutex_exit(&msp->ms_lock);
+		}
+	}
+}
+
+/*
+ * Verify that the sum of the sizes of all blocks in the pool adds up
+ * to the SPA's sa_alloc total.
+ */
+typedef struct zdb_blkstats {
+	uint64_t	zb_asize;
+	uint64_t	zb_lsize;
+	uint64_t	zb_psize;
+	uint64_t	zb_count;
+} zdb_blkstats_t;
+
+#define	DMU_OT_DEFERRED	DMU_OT_NONE
+#define	DMU_OT_TOTAL	DMU_OT_NUMTYPES
+
+#define	ZB_TOTAL	DN_MAX_LEVELS
+
+typedef struct zdb_cb {
+	zdb_blkstats_t	zcb_type[ZB_TOTAL + 1][DMU_OT_TOTAL + 1];
+	uint64_t	zcb_errors[256];
+	int		zcb_readfails;
+	int		zcb_haderrors;
+} zdb_cb_t;
+
+static void
+zdb_count_block(spa_t *spa, zdb_cb_t *zcb, blkptr_t *bp, dmu_object_type_t type)
+{
+	for (int i = 0; i < 4; i++) {
+		int l = (i < 2) ? BP_GET_LEVEL(bp) : ZB_TOTAL;
+		int t = (i & 1) ? type : DMU_OT_TOTAL;
+		zdb_blkstats_t *zb = &zcb->zcb_type[l][t];
+
+		zb->zb_asize += BP_GET_ASIZE(bp);
+		zb->zb_lsize += BP_GET_LSIZE(bp);
+		zb->zb_psize += BP_GET_PSIZE(bp);
+		zb->zb_count++;
+	}
+
+	if (dump_opt['S']) {
+		boolean_t print_sig;
+
+		print_sig = !zdb_sig_user_data || (BP_GET_LEVEL(bp) == 0 &&
+		    BP_GET_TYPE(bp) == DMU_OT_PLAIN_FILE_CONTENTS);
+
+		if (BP_GET_CHECKSUM(bp) < zdb_sig_cksumalg)
+			print_sig = B_FALSE;
+
+		if (print_sig) {
+			(void) printf("%llu\t%lld\t%lld\t%s\t%s\t%s\t"
+			    "%llx:%llx:%llx:%llx\n",
+			    (u_longlong_t)BP_GET_LEVEL(bp),
+			    (longlong_t)BP_GET_PSIZE(bp),
+			    (longlong_t)BP_GET_NDVAS(bp),
+			    dmu_ot[BP_GET_TYPE(bp)].ot_name,
+			    zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name,
+			    zio_compress_table[BP_GET_COMPRESS(bp)].ci_name,
+			    (u_longlong_t)bp->blk_cksum.zc_word[0],
+			    (u_longlong_t)bp->blk_cksum.zc_word[1],
+			    (u_longlong_t)bp->blk_cksum.zc_word[2],
+			    (u_longlong_t)bp->blk_cksum.zc_word[3]);
+		}
+	}
+
+	VERIFY(zio_wait(zio_claim(NULL, spa, spa_first_txg(spa), bp,
+	    NULL, NULL, ZIO_FLAG_MUSTSUCCEED)) == 0);
+}
+
+static int
+zdb_blkptr_cb(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb,
+    const dnode_phys_t *dnp, void *arg)
+{
+	zdb_cb_t *zcb = arg;
+	char blkbuf[BP_SPRINTF_LEN];
+
+	if (bp == NULL)
+		return (0);
+
+	zdb_count_block(spa, zcb, bp, BP_GET_TYPE(bp));
+
+	if (dump_opt['c'] || dump_opt['S']) {
+		int ioerr, size;
+		void *data;
+
+		size = BP_GET_LSIZE(bp);
+		data = malloc(size);
+		ioerr = zio_wait(zio_read(NULL, spa, bp, data, size,
+		    NULL, NULL, ZIO_PRIORITY_ASYNC_READ,
+		    ZIO_FLAG_CANFAIL | ZIO_FLAG_SCRUB, zb));
+		free(data);
+
+		/* We expect io errors on intent log */
+		if (ioerr && BP_GET_TYPE(bp) != DMU_OT_INTENT_LOG) {
+			zcb->zcb_haderrors = 1;
+			zcb->zcb_errors[ioerr]++;
+
+			if (dump_opt['b'] >= 2)
+				sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, bp);
+			else
+				blkbuf[0] = '\0';
+
+			if (!dump_opt['S']) {
+				(void) printf("zdb_blkptr_cb: "
+				    "Got error %d reading "
+				    "<%llu, %llu, %lld, %llx> %s -- skipping\n",
+				    ioerr,
+				    (u_longlong_t)zb->zb_objset,
+				    (u_longlong_t)zb->zb_object,
+				    (u_longlong_t)zb->zb_level,
+				    (u_longlong_t)zb->zb_blkid,
+				    blkbuf);
+			}
+		}
+	}
+
+	zcb->zcb_readfails = 0;
+
+	if (dump_opt['b'] >= 4) {
+		sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, bp);
+		(void) printf("objset %llu object %llu offset 0x%llx %s\n",
+		    (u_longlong_t)zb->zb_objset,
+		    (u_longlong_t)zb->zb_object,
+		    (u_longlong_t)blkid2offset(dnp, zb->zb_level, zb->zb_blkid),
+		    blkbuf);
+	}
+
+	return (0);
+}
+
+static int
+dump_block_stats(spa_t *spa)
+{
+	zdb_cb_t zcb = { 0 };
+	zdb_blkstats_t *zb, *tzb;
+	uint64_t alloc, space, logalloc;
+	vdev_t *rvd = spa->spa_root_vdev;
+	int leaks = 0;
+	int c, e;
+
+	if (!dump_opt['S']) {
+		(void) printf("\nTraversing all blocks to %sverify"
+		    " nothing leaked ...\n",
+		    dump_opt['c'] ? "verify checksums and " : "");
+	}
+
+	/*
+	 * Load all space maps as SM_ALLOC maps, then traverse the pool
+	 * claiming each block we discover.  If the pool is perfectly
+	 * consistent, the space maps will be empty when we're done.
+	 * Anything left over is a leak; any block we can't claim (because
+	 * it's not part of any space map) is a double allocation,
+	 * reference to a freed block, or an unclaimed log block.
+	 */
+	zdb_leak_init(spa);
+
+	/*
+	 * If there's a deferred-free bplist, process that first.
+	 */
+	if (spa->spa_sync_bplist_obj != 0) {
+		bplist_t *bpl = &spa->spa_sync_bplist;
+		blkptr_t blk;
+		uint64_t itor = 0;
+
+		VERIFY(0 == bplist_open(bpl, spa->spa_meta_objset,
+		    spa->spa_sync_bplist_obj));
+
+		while (bplist_iterate(bpl, &itor, &blk) == 0) {
+			if (dump_opt['b'] >= 4) {
+				char blkbuf[BP_SPRINTF_LEN];
+				sprintf_blkptr(blkbuf, BP_SPRINTF_LEN, &blk);
+				(void) printf("[%s] %s\n",
+				    "deferred free", blkbuf);
+			}
+			zdb_count_block(spa, &zcb, &blk, DMU_OT_DEFERRED);
+		}
+
+		bplist_close(bpl);
+	}
+
+	zcb.zcb_haderrors |= traverse_pool(spa, zdb_blkptr_cb, &zcb);
+
+	if (zcb.zcb_haderrors && !dump_opt['S']) {
+		(void) printf("\nError counts:\n\n");
+		(void) printf("\t%5s  %s\n", "errno", "count");
+		for (e = 0; e < 256; e++) {
+			if (zcb.zcb_errors[e] != 0) {
+				(void) printf("\t%5d  %llu\n",
+				    e, (u_longlong_t)zcb.zcb_errors[e]);
+			}
+		}
+	}
+
+	/*
+	 * Report any leaked segments.
+	 */
+	zdb_leak_fini(spa);
+
+	/*
+	 * If we're interested in printing out the blkptr signatures,
+	 * return now as we don't print out anything else (including
+	 * errors and leaks).
+	 */
+	if (dump_opt['S'])
+		return (zcb.zcb_haderrors ? 3 : 0);
+
+	alloc = spa_get_alloc(spa);
+	space = spa_get_space(spa);
+
+	/*
+	 * Log blocks allocated from a separate log device don't count
+	 * as part of the normal pool space; factor them in here.
+	 */
+	logalloc = 0;
+
+	for (c = 0; c < rvd->vdev_children; c++)
+		if (rvd->vdev_child[c]->vdev_islog)
+			logalloc += rvd->vdev_child[c]->vdev_stat.vs_alloc;
+
+	tzb = &zcb.zcb_type[ZB_TOTAL][DMU_OT_TOTAL];
+
+	if (tzb->zb_asize == alloc + logalloc) {
+		(void) printf("\n\tNo leaks (block sum matches space"
+		    " maps exactly)\n");
+	} else {
+		(void) printf("block traversal size %llu != alloc %llu "
+		    "(leaked %lld)\n",
+		    (u_longlong_t)tzb->zb_asize,
+		    (u_longlong_t)alloc + logalloc,
+		    (u_longlong_t)(alloc + logalloc - tzb->zb_asize));
+		leaks = 1;
+	}
+
+	if (tzb->zb_count == 0)
+		return (2);
+
+	(void) printf("\n");
+	(void) printf("\tbp count:      %10llu\n",
+	    (u_longlong_t)tzb->zb_count);
+	(void) printf("\tbp logical:    %10llu\t avg: %6llu\n",
+	    (u_longlong_t)tzb->zb_lsize,
+	    (u_longlong_t)(tzb->zb_lsize / tzb->zb_count));
+	(void) printf("\tbp physical:   %10llu\t avg:"
+	    " %6llu\tcompression: %6.2f\n",
+	    (u_longlong_t)tzb->zb_psize,
+	    (u_longlong_t)(tzb->zb_psize / tzb->zb_count),
+	    (double)tzb->zb_lsize / tzb->zb_psize);
+	(void) printf("\tbp allocated:  %10llu\t avg:"
+	    " %6llu\tcompression: %6.2f\n",
+	    (u_longlong_t)tzb->zb_asize,
+	    (u_longlong_t)(tzb->zb_asize / tzb->zb_count),
+	    (double)tzb->zb_lsize / tzb->zb_asize);
+	(void) printf("\tSPA allocated: %10llu\tused: %5.2f%%\n",
+	    (u_longlong_t)alloc, 100.0 * alloc / space);
+
+	if (dump_opt['b'] >= 2) {
+		int l, t, level;
+		(void) printf("\nBlocks\tLSIZE\tPSIZE\tASIZE"
+		    "\t  avg\t comp\t%%Total\tType\n");
+
+		for (t = 0; t <= DMU_OT_NUMTYPES; t++) {
+			char csize[6], lsize[6], psize[6], asize[6], avg[6];
+			char *typename;
+
+			typename = t == DMU_OT_DEFERRED ? "deferred free" :
+			    t == DMU_OT_TOTAL ? "Total" : dmu_ot[t].ot_name;
+
+			if (zcb.zcb_type[ZB_TOTAL][t].zb_asize == 0) {
+				(void) printf("%6s\t%5s\t%5s\t%5s"
+				    "\t%5s\t%5s\t%6s\t%s\n",
+				    "-",
+				    "-",
+				    "-",
+				    "-",
+				    "-",
+				    "-",
+				    "-",
+				    typename);
+				continue;
+			}
+
+			for (l = ZB_TOTAL - 1; l >= -1; l--) {
+				level = (l == -1 ? ZB_TOTAL : l);
+				zb = &zcb.zcb_type[level][t];
+
+				if (zb->zb_asize == 0)
+					continue;
+
+				if (dump_opt['b'] < 3 && level != ZB_TOTAL)
+					continue;
+
+				if (level == 0 && zb->zb_asize ==
+				    zcb.zcb_type[ZB_TOTAL][t].zb_asize)
+					continue;
+
+				nicenum(zb->zb_count, csize);
+				nicenum(zb->zb_lsize, lsize);
+				nicenum(zb->zb_psize, psize);
+				nicenum(zb->zb_asize, asize);
+				nicenum(zb->zb_asize / zb->zb_count, avg);
+
+				(void) printf("%6s\t%5s\t%5s\t%5s\t%5s"
+				    "\t%5.2f\t%6.2f\t",
+				    csize, lsize, psize, asize, avg,
+				    (double)zb->zb_lsize / zb->zb_psize,
+				    100.0 * zb->zb_asize / tzb->zb_asize);
+
+				if (level == ZB_TOTAL)
+					(void) printf("%s\n", typename);
+				else
+					(void) printf("    L%d %s\n",
+					    level, typename);
+			}
+		}
+	}
+
+	(void) printf("\n");
+
+	if (leaks)
+		return (2);
+
+	if (zcb.zcb_haderrors)
+		return (3);
+
+	return (0);
+}
+
+static void
+dump_zpool(spa_t *spa)
+{
+	dsl_pool_t *dp = spa_get_dsl(spa);
+	int rc = 0;
+
+	if (dump_opt['u'])
+		dump_uberblock(&spa->spa_uberblock);
+
+	if (dump_opt['d'] || dump_opt['i']) {
+		dump_dir(dp->dp_meta_objset);
+		if (dump_opt['d'] >= 3) {
+			dump_bplist(dp->dp_meta_objset,
+			    spa->spa_sync_bplist_obj, "Deferred frees");
+			dump_dtl(spa->spa_root_vdev, 0);
+			dump_metaslabs(spa);
+		}
+		(void) dmu_objset_find(spa_name(spa), dump_one_dir, NULL,
+		    DS_FIND_SNAPSHOTS | DS_FIND_CHILDREN);
+	}
+
+	if (dump_opt['b'] || dump_opt['c'] || dump_opt['S'])
+		rc = dump_block_stats(spa);
+
+	if (dump_opt['s'])
+		show_pool_stats(spa);
+
+	if (rc != 0)
+		exit(rc);
+}
+
+#define	ZDB_FLAG_CHECKSUM	0x0001
+#define	ZDB_FLAG_DECOMPRESS	0x0002
+#define	ZDB_FLAG_BSWAP		0x0004
+#define	ZDB_FLAG_GBH		0x0008
+#define	ZDB_FLAG_INDIRECT	0x0010
+#define	ZDB_FLAG_PHYS		0x0020
+#define	ZDB_FLAG_RAW		0x0040
+#define	ZDB_FLAG_PRINT_BLKPTR	0x0080
+
+int flagbits[256];
+
+static void
+zdb_print_blkptr(blkptr_t *bp, int flags)
+{
+	dva_t *dva = bp->blk_dva;
+	int d;
+
+	if (flags & ZDB_FLAG_BSWAP)
+		byteswap_uint64_array((void *)bp, sizeof (blkptr_t));
+	/*
+	 * Super-ick warning:  This code is also duplicated in
+	 * cmd/mdb/common/modules/zfs/zfs.c .  Yeah, I hate code
+	 * replication, too.
+	 */
+	for (d = 0; d < BP_GET_NDVAS(bp); d++) {
+		(void) printf("\tDVA[%d]: vdev_id %lld / %llx\n", d,
+		    (longlong_t)DVA_GET_VDEV(&dva[d]),
+		    (longlong_t)DVA_GET_OFFSET(&dva[d]));
+		(void) printf("\tDVA[%d]:       GANG: %-5s  GRID:  %04llx\t"
+		    "ASIZE: %llx\n", d,
+		    DVA_GET_GANG(&dva[d]) ? "TRUE" : "FALSE",
+		    (longlong_t)DVA_GET_GRID(&dva[d]),
+		    (longlong_t)DVA_GET_ASIZE(&dva[d]));
+		(void) printf("\tDVA[%d]: :%llu:%llx:%llx:%s%s%s%s\n", d,
+		    (u_longlong_t)DVA_GET_VDEV(&dva[d]),
+		    (longlong_t)DVA_GET_OFFSET(&dva[d]),
+		    (longlong_t)BP_GET_PSIZE(bp),
+		    BP_SHOULD_BYTESWAP(bp) ? "e" : "",
+		    !DVA_GET_GANG(&dva[d]) && BP_GET_LEVEL(bp) != 0 ?
+		    "d" : "",
+		    DVA_GET_GANG(&dva[d]) ? "g" : "",
+		    BP_GET_COMPRESS(bp) != 0 ? "d" : "");
+	}
+	(void) printf("\tLSIZE:  %-16llx\t\tPSIZE: %llx\n",
+	    (longlong_t)BP_GET_LSIZE(bp), (longlong_t)BP_GET_PSIZE(bp));
+	(void) printf("\tENDIAN: %6s\t\t\t\t\tTYPE:  %s\n",
+	    BP_GET_BYTEORDER(bp) ? "LITTLE" : "BIG",
+	    dmu_ot[BP_GET_TYPE(bp)].ot_name);
+	(void) printf("\tBIRTH:  %-16llx   LEVEL: %-2llu\tFILL:  %llx\n",
+	    (u_longlong_t)bp->blk_birth, (u_longlong_t)BP_GET_LEVEL(bp),
+	    (u_longlong_t)bp->blk_fill);
+	(void) printf("\tCKFUNC: %-16s\t\tCOMP:  %s\n",
+	    zio_checksum_table[BP_GET_CHECKSUM(bp)].ci_name,
+	    zio_compress_table[BP_GET_COMPRESS(bp)].ci_name);
+	(void) printf("\tCKSUM:  %llx:%llx:%llx:%llx\n",
+	    (u_longlong_t)bp->blk_cksum.zc_word[0],
+	    (u_longlong_t)bp->blk_cksum.zc_word[1],
+	    (u_longlong_t)bp->blk_cksum.zc_word[2],
+	    (u_longlong_t)bp->blk_cksum.zc_word[3]);
+}
+
+static void
+zdb_dump_indirect(blkptr_t *bp, int nbps, int flags)
+{
+	int i;
+
+	for (i = 0; i < nbps; i++)
+		zdb_print_blkptr(&bp[i], flags);
+}
+
+static void
+zdb_dump_gbh(void *buf, int flags)
+{
+	zdb_dump_indirect((blkptr_t *)buf, SPA_GBH_NBLKPTRS, flags);
+}
+
+static void
+zdb_dump_block_raw(void *buf, uint64_t size, int flags)
+{
+	if (flags & ZDB_FLAG_BSWAP)
+		byteswap_uint64_array(buf, size);
+	(void) write(2, buf, size);
+}
+
+static void
+zdb_dump_block(char *label, void *buf, uint64_t size, int flags)
+{
+	uint64_t *d = (uint64_t *)buf;
+	int nwords = size / sizeof (uint64_t);
+	int do_bswap = !!(flags & ZDB_FLAG_BSWAP);
+	int i, j;
+	char *hdr, *c;
+
+
+	if (do_bswap)
+		hdr = " 7 6 5 4 3 2 1 0   f e d c b a 9 8";
+	else
+		hdr = " 0 1 2 3 4 5 6 7   8 9 a b c d e f";
+
+	(void) printf("\n%s\n%6s   %s  0123456789abcdef\n", label, "", hdr);
+
+	for (i = 0; i < nwords; i += 2) {
+		(void) printf("%06llx:  %016llx  %016llx  ",
+		    (u_longlong_t)(i * sizeof (uint64_t)),
+		    (u_longlong_t)(do_bswap ? BSWAP_64(d[i]) : d[i]),
+		    (u_longlong_t)(do_bswap ? BSWAP_64(d[i + 1]) : d[i + 1]));
+
+		c = (char *)&d[i];
+		for (j = 0; j < 2 * sizeof (uint64_t); j++)
+			(void) printf("%c", isprint(c[j]) ? c[j] : '.');
+		(void) printf("\n");
+	}
+}
+
+/*
+ * There are two acceptable formats:
+ *	leaf_name	  - For example: c1t0d0 or /tmp/ztest.0a
+ *	child[.child]*    - For example: 0.1.1
+ *
+ * The second form can be used to specify arbitrary vdevs anywhere
+ * in the heirarchy.  For example, in a pool with a mirror of
+ * RAID-Zs, you can specify either RAID-Z vdev with 0.0 or 0.1 .
+ */
+static vdev_t *
+zdb_vdev_lookup(vdev_t *vdev, char *path)
+{
+	char *s, *p, *q;
+	int i;
+
+	if (vdev == NULL)
+		return (NULL);
+
+	/* First, assume the x.x.x.x format */
+	i = (int)strtoul(path, &s, 10);
+	if (s == path || (s && *s != '.' && *s != '\0'))
+		goto name;
+	if (i < 0 || i >= vdev->vdev_children)
+		return (NULL);
+
+	vdev = vdev->vdev_child[i];
+	if (*s == '\0')
+		return (vdev);
+	return (zdb_vdev_lookup(vdev, s+1));
+
+name:
+	for (i = 0; i < vdev->vdev_children; i++) {
+		vdev_t *vc = vdev->vdev_child[i];
+
+		if (vc->vdev_path == NULL) {
+			vc = zdb_vdev_lookup(vc, path);
+			if (vc == NULL)
+				continue;
+			else
+				return (vc);
+		}
+
+		p = strrchr(vc->vdev_path, '/');
+		p = p ? p + 1 : vc->vdev_path;
+		q = &vc->vdev_path[strlen(vc->vdev_path) - 2];
+
+		if (strcmp(vc->vdev_path, path) == 0)
+			return (vc);
+		if (strcmp(p, path) == 0)
+			return (vc);
+		if (strcmp(q, "s0") == 0 && strncmp(p, path, q - p) == 0)
+			return (vc);
+	}
+
+	return (NULL);
+}
+
+/*
+ * Read a block from a pool and print it out.  The syntax of the
+ * block descriptor is:
+ *
+ *	pool:vdev_specifier:offset:size[:flags]
+ *
+ *	pool           - The name of the pool you wish to read from
+ *	vdev_specifier - Which vdev (see comment for zdb_vdev_lookup)
+ *	offset         - offset, in hex, in bytes
+ *	size           - Amount of data to read, in hex, in bytes
+ *	flags          - A string of characters specifying options
+ *		 b: Decode a blkptr at given offset within block
+ *		*c: Calculate and display checksums
+ *		*d: Decompress data before dumping
+ *		 e: Byteswap data before dumping
+ *		*g: Display data as a gang block header
+ *		*i: Display as an indirect block
+ *		 p: Do I/O to physical offset
+ *		 r: Dump raw data to stdout
+ *
+ *              * = not yet implemented
+ */
+static void
+zdb_read_block(char *thing, spa_t **spap)
+{
+	spa_t *spa = *spap;
+	int flags = 0;
+	uint64_t offset = 0, size = 0, blkptr_offset = 0;
+	zio_t *zio;
+	vdev_t *vd;
+	void *buf;
+	char *s, *p, *dup, *pool, *vdev, *flagstr;
+	int i, error, zio_flags;
+
+	dup = strdup(thing);
+	s = strtok(dup, ":");
+	pool = s ? s : "";
+	s = strtok(NULL, ":");
+	vdev = s ? s : "";
+	s = strtok(NULL, ":");
+	offset = strtoull(s ? s : "", NULL, 16);
+	s = strtok(NULL, ":");
+	size = strtoull(s ? s : "", NULL, 16);
+	s = strtok(NULL, ":");
+	flagstr = s ? s : "";
+
+	s = NULL;
+	if (size == 0)
+		s = "size must not be zero";
+	if (!IS_P2ALIGNED(size, DEV_BSIZE))
+		s = "size must be a multiple of sector size";
+	if (!IS_P2ALIGNED(offset, DEV_BSIZE))
+		s = "offset must be a multiple of sector size";
+	if (s) {
+		(void) printf("Invalid block specifier: %s  - %s\n", thing, s);
+		free(dup);
+		return;
+	}
+
+	for (s = strtok(flagstr, ":"); s; s = strtok(NULL, ":")) {
+		for (i = 0; flagstr[i]; i++) {
+			int bit = flagbits[(uchar_t)flagstr[i]];
+
+			if (bit == 0) {
+				(void) printf("***Invalid flag: %c\n",
+				    flagstr[i]);
+				continue;
+			}
+			flags |= bit;
+
+			/* If it's not something with an argument, keep going */
+			if ((bit & (ZDB_FLAG_CHECKSUM | ZDB_FLAG_DECOMPRESS |
+			    ZDB_FLAG_PRINT_BLKPTR)) == 0)
+				continue;
+
+			p = &flagstr[i + 1];
+			if (bit == ZDB_FLAG_PRINT_BLKPTR)
+				blkptr_offset = strtoull(p, &p, 16);
+			if (*p != ':' && *p != '\0') {
+				(void) printf("***Invalid flag arg: '%s'\n", s);
+				free(dup);
+				return;
+			}
+		}
+	}
+
+	if (spa == NULL || strcmp(spa_name(spa), pool) != 0) {
+		if (spa)
+			spa_close(spa, (void *)zdb_read_block);
+		error = spa_open(pool, spap, (void *)zdb_read_block);
+		if (error)
+			fatal("Failed to open pool '%s': %s",
+			    pool, strerror(error));
+		spa = *spap;
+	}
+
+	vd = zdb_vdev_lookup(spa->spa_root_vdev, vdev);
+	if (vd == NULL) {
+		(void) printf("***Invalid vdev: %s\n", vdev);
+		free(dup);
+		return;
+	} else {
+		if (vd->vdev_path)
+			(void) printf("Found vdev: %s\n", vd->vdev_path);
+		else
+			(void) printf("Found vdev type: %s\n",
+			    vd->vdev_ops->vdev_op_type);
+	}
+
+	buf = umem_alloc(size, UMEM_NOFAIL);
+
+	zio_flags = ZIO_FLAG_DONT_CACHE | ZIO_FLAG_DONT_QUEUE |
+	    ZIO_FLAG_DONT_PROPAGATE | ZIO_FLAG_DONT_RETRY;
+
+	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
+	zio = zio_root(spa, NULL, NULL, 0);
+	/* XXX todo - cons up a BP so RAID-Z will be happy */
+	zio_nowait(zio_vdev_child_io(zio, NULL, vd, offset, buf, size,
+	    ZIO_TYPE_READ, ZIO_PRIORITY_SYNC_READ, zio_flags, NULL, NULL));
+	error = zio_wait(zio);
+	spa_config_exit(spa, SCL_STATE, FTAG);
+
+	if (error) {
+		(void) printf("Read of %s failed, error: %d\n", thing, error);
+		goto out;
+	}
+
+	if (flags & ZDB_FLAG_PRINT_BLKPTR)
+		zdb_print_blkptr((blkptr_t *)(void *)
+		    ((uintptr_t)buf + (uintptr_t)blkptr_offset), flags);
+	else if (flags & ZDB_FLAG_RAW)
+		zdb_dump_block_raw(buf, size, flags);
+	else if (flags & ZDB_FLAG_INDIRECT)
+		zdb_dump_indirect((blkptr_t *)buf, size / sizeof (blkptr_t),
+		    flags);
+	else if (flags & ZDB_FLAG_GBH)
+		zdb_dump_gbh(buf, flags);
+	else
+		zdb_dump_block(thing, buf, size, flags);
+
+out:
+	umem_free(buf, size);
+	free(dup);
+}
+
+static boolean_t
+nvlist_string_match(nvlist_t *config, char *name, char *tgt)
+{
+	char *s;
+
+	if (nvlist_lookup_string(config, name, &s) != 0)
+		return (B_FALSE);
+
+	return (strcmp(s, tgt) == 0);
+}
+
+static boolean_t
+nvlist_uint64_match(nvlist_t *config, char *name, uint64_t tgt)
+{
+	uint64_t val;
+
+	if (nvlist_lookup_uint64(config, name, &val) != 0)
+		return (B_FALSE);
+
+	return (val == tgt);
+}
+
+static boolean_t
+vdev_child_guid_match(nvlist_t *vdev, uint64_t guid)
+{
+	nvlist_t **child;
+	uint_t c, children;
+
+	verify(nvlist_lookup_nvlist_array(vdev, ZPOOL_CONFIG_CHILDREN,
+	    &child, &children) == 0);
+	for (c = 0; c < children; ++c)
+		if (nvlist_uint64_match(child[c], ZPOOL_CONFIG_GUID, guid))
+			return (B_TRUE);
+	return (B_FALSE);
+}
+
+static boolean_t
+vdev_child_string_match(nvlist_t *vdev, char *tgt)
+{
+	nvlist_t **child;
+	uint_t c, children;
+
+	verify(nvlist_lookup_nvlist_array(vdev, ZPOOL_CONFIG_CHILDREN,
+	    &child, &children) == 0);
+	for (c = 0; c < children; ++c) {
+		if (nvlist_string_match(child[c], ZPOOL_CONFIG_PATH, tgt) ||
+		    nvlist_string_match(child[c], ZPOOL_CONFIG_DEVID, tgt))
+			return (B_TRUE);
+	}
+	return (B_FALSE);
+}
+
+static boolean_t
+vdev_guid_match(nvlist_t *config, uint64_t guid)
+{
+	nvlist_t *nvroot;
+
+	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
+	    &nvroot) == 0);
+
+	return (nvlist_uint64_match(nvroot, ZPOOL_CONFIG_GUID, guid) ||
+	    vdev_child_guid_match(nvroot, guid));
+}
+
+static boolean_t
+vdev_string_match(nvlist_t *config, char *tgt)
+{
+	nvlist_t *nvroot;
+
+	verify(nvlist_lookup_nvlist(config, ZPOOL_CONFIG_VDEV_TREE,
+	    &nvroot) == 0);
+
+	return (vdev_child_string_match(nvroot, tgt));
+}
+
+static boolean_t
+pool_match(nvlist_t *config, char *tgt)
+{
+	uint64_t guid = strtoull(tgt, NULL, 0);
+
+	if (guid != 0) {
+		return (
+		    nvlist_uint64_match(config, ZPOOL_CONFIG_POOL_GUID, guid) ||
+		    vdev_guid_match(config, guid));
+	} else {
+		return (
+		    nvlist_string_match(config, ZPOOL_CONFIG_POOL_NAME, tgt) ||
+		    vdev_string_match(config, tgt));
+	}
+}
+
+static int
+find_exported_zpool(char *pool_id, nvlist_t **configp, char *vdev_dir)
+{
+	nvlist_t *pools;
+	int error = ENOENT;
+	nvlist_t *match = NULL;
+
+	if (vdev_dir != NULL)
+		pools = zpool_find_import_activeok(g_zfs, 1, &vdev_dir);
+	else
+		pools = zpool_find_import_activeok(g_zfs, 0, NULL);
+
+	if (pools != NULL) {
+		nvpair_t *elem = NULL;
+
+		while ((elem = nvlist_next_nvpair(pools, elem)) != NULL) {
+			verify(nvpair_value_nvlist(elem, configp) == 0);
+			if (pool_match(*configp, pool_id)) {
+				if (match != NULL) {
+					(void) fatal(
+					    "More than one matching pool - "
+					    "specify guid/devid/device path.");
+				} else {
+					match = *configp;
+					error = 0;
+				}
+			}
+		}
+	}
+
+	*configp = error ? NULL : match;
+
+	return (error);
+}
+
+int
+main(int argc, char **argv)
+{
+	int i, c;
+	struct rlimit rl = { 1024, 1024 };
+	spa_t *spa;
+	objset_t *os = NULL;
+	char *endstr;
+	int dump_all = 1;
+	int verbose = 0;
+	int error;
+	int exported = 0;
+	char *vdev_dir = NULL;
+
+	(void) setrlimit(RLIMIT_NOFILE, &rl);
+	(void) enable_extended_FILE_stdio(-1, -1);
+
+	dprintf_setup(&argc, argv);
+
+	while ((c = getopt(argc, argv, "udibcsvCS:U:lRep:")) != -1) {
+		switch (c) {
+		case 'u':
+		case 'd':
+		case 'i':
+		case 'b':
+		case 'c':
+		case 's':
+		case 'C':
+		case 'l':
+		case 'R':
+			dump_opt[c]++;
+			dump_all = 0;
+			break;
+		case 'v':
+			verbose++;
+			break;
+		case 'U':
+			spa_config_path = optarg;
+			break;
+		case 'e':
+			exported = 1;
+			break;
+		case 'p':
+			vdev_dir = optarg;
+			break;
+		case 'S':
+			dump_opt[c]++;
+			dump_all = 0;
+			zdb_sig_user_data = (strncmp(optarg, "user:", 5) == 0);
+			if (!zdb_sig_user_data && strncmp(optarg, "all:", 4))
+				usage();
+			endstr = strchr(optarg, ':') + 1;
+			if (strcmp(endstr, "fletcher2") == 0)
+				zdb_sig_cksumalg = ZIO_CHECKSUM_FLETCHER_2;
+			else if (strcmp(endstr, "fletcher4") == 0)
+				zdb_sig_cksumalg = ZIO_CHECKSUM_FLETCHER_4;
+			else if (strcmp(endstr, "sha256") == 0)
+				zdb_sig_cksumalg = ZIO_CHECKSUM_SHA256;
+			else if (strcmp(endstr, "all") == 0)
+				zdb_sig_cksumalg = ZIO_CHECKSUM_FLETCHER_2;
+			else
+				usage();
+			break;
+		default:
+			usage();
+			break;
+		}
+	}
+
+	if (vdev_dir != NULL && exported == 0) {
+		(void) fprintf(stderr, "-p option requires use of -e\n");
+		usage();
+	}
+
+	kernel_init(FREAD);
+	g_zfs = libzfs_init();
+	ASSERT(g_zfs != NULL);
+
+	for (c = 0; c < 256; c++) {
+		if (dump_all && c != 'l' && c != 'R')
+			dump_opt[c] = 1;
+		if (dump_opt[c])
+			dump_opt[c] += verbose;
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	if (argc < 1) {
+		if (dump_opt['C']) {
+			dump_cachefile(spa_config_path);
+			return (0);
+		}
+		usage();
+	}
+
+	if (dump_opt['l']) {
+		dump_label(argv[0]);
+		return (0);
+	}
+
+	if (dump_opt['R']) {
+		flagbits['b'] = ZDB_FLAG_PRINT_BLKPTR;
+		flagbits['c'] = ZDB_FLAG_CHECKSUM;
+		flagbits['d'] = ZDB_FLAG_DECOMPRESS;
+		flagbits['e'] = ZDB_FLAG_BSWAP;
+		flagbits['g'] = ZDB_FLAG_GBH;
+		flagbits['i'] = ZDB_FLAG_INDIRECT;
+		flagbits['p'] = ZDB_FLAG_PHYS;
+		flagbits['r'] = ZDB_FLAG_RAW;
+
+		spa = NULL;
+		while (argv[0]) {
+			zdb_read_block(argv[0], &spa);
+			argv++;
+			argc--;
+		}
+		if (spa)
+			spa_close(spa, (void *)zdb_read_block);
+		return (0);
+	}
+
+	if (dump_opt['C'])
+		dump_config(argv[0]);
+
+	error = 0;
+	if (exported) {
+		/*
+		 * Check to see if the name refers to an exported zpool
+		 */
+		char *slash;
+		nvlist_t *exported_conf = NULL;
+
+		if ((slash = strchr(argv[0], '/')) != NULL)
+			*slash = '\0';
+
+		error = find_exported_zpool(argv[0], &exported_conf, vdev_dir);
+		if (error == 0) {
+			nvlist_t *nvl = NULL;
+
+			if (vdev_dir != NULL) {
+				if (nvlist_alloc(&nvl, NV_UNIQUE_NAME, 0) != 0)
+					error = ENOMEM;
+				else if (nvlist_add_string(nvl,
+				    zpool_prop_to_name(ZPOOL_PROP_ALTROOT),
+				    vdev_dir) != 0)
+					error = ENOMEM;
+			}
+
+			if (error == 0)
+				error = spa_import_faulted(argv[0],
+				    exported_conf, nvl);
+
+			nvlist_free(nvl);
+		}
+
+		if (slash != NULL)
+			*slash = '/';
+	}
+
+	if (error == 0) {
+		if (strchr(argv[0], '/') != NULL) {
+			error = dmu_objset_open(argv[0], DMU_OST_ANY,
+			    DS_MODE_USER | DS_MODE_READONLY, &os);
+		} else {
+			error = spa_open(argv[0], &spa, FTAG);
+		}
+	}
+
+	if (error)
+		fatal("can't open %s: %s", argv[0], strerror(error));
+
+	argv++;
+	if (--argc > 0) {
+		zopt_objects = argc;
+		zopt_object = calloc(zopt_objects, sizeof (uint64_t));
+		for (i = 0; i < zopt_objects; i++) {
+			errno = 0;
+			zopt_object[i] = strtoull(argv[i], NULL, 0);
+			if (zopt_object[i] == 0 && errno != 0)
+				fatal("bad object number %s: %s",
+				    argv[i], strerror(errno));
+		}
+	}
+
+	if (os != NULL) {
+		dump_dir(os);
+		dmu_objset_close(os);
+	} else {
+		dump_zpool(spa);
+		spa_close(spa, FTAG);
+	}
+
+	fuid_table_destroy();
+
+	libzfs_fini(g_zfs);
+	kernel_fini();
+
+	return (0);
+}